Shaft truing and grinding device



H. E. PARKENSON Ji 2U Ii 925.

SHAFT TRUING AND GRINDING DEVICE Filed Sept. '7, 1922 2 Sheets-$heet 1H. E. PARKFNSON SHAFT TRUING AND GRINDING DEVICE Filed Sept, 7, 1922 2Sheets-Sheet 2 Fit.

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Utnur' sraras HOWARD E. PARKINSUN, F IBALFOUR, NORTH CAROLINA.

SHAFT TRUTNG AND GRINDING- DEVICE.

- Application filed September 7, 1922. Serial No. %,659.

To all whom, it may concern: 1

Be it known that ll, HOWARD E. PARKIN- soN, a citizenof the UnitedStates ofAmerica, residing at Balfour, in the county of Henderson andState of North Carolina,

have invented new and useful Improve-- cially the pitmanrod journalportions of crank shafts which aroused in connection with internalcombustion motors and the like; and with this object in view theinvention consists in a construction and combination of parts of which apreferred embodiment is shown in the accompanying. drawings, whereinFigure l is a plan, and

Figure 2 is a side view of an apparatus embodying the invention as seenwhen applied to a crank shaft. t

Figure 3 is a sectional View on the plane indicated by the line 33 ofFigure 1..

Figure t is a detail view of the liner guide. V a

The apparatus consists of a main guide providedv at one end with abearing jaw 11 and having mounted thereon a carriage l2 movable by meansof a manually operable feed screw 13 swiveled at 14 on the guide bar andcarrying a grinder head 15 of which the shaft 16 is actuable by a motor17 supported by the carriage. The grinder head consists of or isprovided with an emery disk 18 which by the adjustment of the carriageis movable toward and from a bearing head 19 carried by the jaw 11 so vas to contact with diametrically opposite portions of the surface of thejournal portion 20 of a crank shaft 21 or the equivalent thereof. Alsocarried by the guide bar is a bearing block 22 adjustable by means of amanually operable feed screw 23 toward and from a center line connectingthe grinding and bearing heads, so as to be adaptable in position to thediameter of the shaft journal which is to be ground and properlyposition the axis of said journal with relation to the line of the axisof the grinder head. The shaft of the grinder head is preferablyprovided with a flexible section 24l-consisting of a coiled s'pri andserving as a cushioning means to avoid injury to the shaft ournal whichis being ground and] at the same time maintain a yielding tensionedpressure thereon. a

The crank shaft of which the journals are to be truedor ground ispreferably accurately supported" for rotation by center points 25arranged in a suitable supporting frame such, for example, as thatindicated at 26 and in connection with the guide bar of the apparatusthere is employed a liner guide 27 secured to the main guide by means ofa clamp 28 or its equivalent and having an arm 29 provided with terminalspaced jaws 30 and 81 to engage the aligned journal of the crank shaftso as to maintain the ap: paratus in a position to insure the axialalignmentof the corresponding connecting is adjustable toward and fromthe other and is adapted to be secured in its adjusted position by meansof a set screw 32 or the equivalent thereof.

Rotary motion being communicated to the grinder head from the motor orfrom any other source of energy (it being obvious that while preferablyarranged on the carriage the motor does not necessarily constitute aninseparable part of the mechanism) and the apparatus being applied tothe properly supported crank shaft in such a way as to dispose thegrinding face of the head, the opposed bearing head of the jaw 11 andthe bearing block 22 in contact with the surface of the journal to beground or trued, it will be obvious that the rotation of the crank shaftwith relation to the apparatus or the swinging of the apparatus aroundthe crank shaft journals which are engaged respectively by the grindingmeans and. the jaws of the liner guide, will bring the face of thegrinder head into contact progressively with all o-rtions of the surfaceof the journal to re uce any irregularity therein and restore it'to aperfectly round condition so that by the employment of suitable bearingsleeves or packing or by the adjustment of the bearing, an accuratemounting of the pitman'or connecting rod may be made thereon.

Having described the-invention, what is claimed as new and useful is l.A truing apparatus for shaft journals having a guide provided with abearing jaw, and a revoluble grinder head movable toward and from andhaving its axis arranged inc in angular relation with the plane of thebearing jaw, means being provided for communicating rotary motion to thegrinder head and the latter having means for effecting a yieldingtensioned pressure on the journal being ground.

2. A truing apparatus for shaftjournals having a guide provided with. abearing jaw, and airevoluble grinder head movable toward and from andhaving its axis arranged in angular relation with the plane of thebearing jaw, means being provided for communicating rotary motion to thegrinder head, a carriage being mounted upon the said guide and havingbearings for the shaft of the grinder head, and a motor supported by theguide and having a flexible shaft connection with "that of the grinderhead. j

3. A truing apparatus for shaft journals having a guide provided with abearing jaw, and a revoluble grinder head movable toward and from andhaving its axis arranged in angular relation with the plane of thebearing -jaw,' means being provided ior communicating rotary motion tothe grinder head, in combination with a liner guide carried by saidfirst-named guide and and a revoluble grinder head movable toward andfrom and having its axis ar ranged in angular relation with the plane ofthe bearing jaw, means being provided for communicating rotary motion tothe grinder head, in combination with a liner guide carried by saidfirst-named guide and provided'with jaws for engaging an aligned journalof the shaft, one of the jaws oi the liner guide being adjustable withrelation to the other.

5. A truing apparatus for shaft journals having a revoluble grinder headand in ans for positioning the same to eileet a grinding operation on ashaft journal, in combination with a guide operatively connected withsaid .IDBEIDS and attachableto a remote aligned journal to insure thegrinding of the journal being operated upon being aligned with saidremote journal.

Intestimony whereof he aliixes his signa' ture.

HOWARD E. PARKINSON.

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